In layman Swift (2)--Control flow

In addition to having all C control flow structures, Swift also has the for...in in OC ... The structure facilitates traversal of arrays, dictionaries, and so on.

Cycle

The swift cycle provides four structures:

<1>for...in: Commonly used to iterate over arrays, similar to Forearch in C #

var myArray = ["string1",123,456]
for i in myArray{
   println("item is \(i)")
}

var myArray = ["v1":"string1","v2":123,"v2":11.34]
for (name,value) in myArray{
    println("key name=\(name)   key value=\(value)")
}

<2>for...condition...increment: This structure is the same as OC's for.

for var i=0; i<10; i++{
   println("index is \(i)")
}

<3>while: As with OC's while

while 1<2 {
  println("this is while loop")
}

<4>do...while: Same as OC's Do...while

do{
  println("this is do while")
}while 1<2

"Conditional Statement"

<1>if...else

if 1<2 {
  .......
}
else if 1<3{
  .......
}
else{
  .......
}

<2>switch

var num:int

switch num {
   case 1:
   case 2:
       println("num is 2")
   case 3:
      println("num is 3")
   case 4,5,6:
      println("num is 4 or 5 or 6")
   default:
     println("num is not 1 or 2 or 3")   
}

In layman Swift (2)--Control flow